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Sperimentazione
di tecniche di distribuzione
controllata dei digestati
e di inibitori della nitrificazione

25 Maggio 2022 da Dig-control

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Digestate is the anaerobic digestion by-product that can be used as an organic fertilizer, but some agronomic and environmental concerns still hinder its application on land.

This study aims to evaluate the agronomic performances (i.e., silage maize dry yield, protein content and N uptake) and -environmental sustainability of solid and liquid digestate fraction application in a field experiment involving two farms with different textures covering about 47 ha in North Italy.

Mineral fertilizer “MF”, mineral fertilizer in variable rate application (VRA), liquid digestate with a nitrification inhibitor, liquid digestate in VRA, liquid digestate with a nitrification inhibitor in VRA and solid digestate “SD” were applied to silage maize (Zea mays L.) in 2019 and 2020 cropping seasons.

Results showed that both digestate fractions gave satisfying agronomic performances (i.e., dry biomass > 13 t ha-1 and protein content > 6.8%) comparable to those of mineral fertilizers, irrespective of soil type and application techniques.

On the contrary, system sustainability investigated with a spatial evaluation of nitrogen use efficiency (NUE) revealed a strong interaction between NUE and soil texture.

Indeed, in fine-textured soil only the adoption of both VRA and the nitrification inhibitor allowed the liquid digestate to reach the “sustainability zone” while SD exhibited poor NUE (e.g., < 50%).

In conclusion, liquid digestate fraction might be an effective substitute for mineral fertilizers in silty soils meeting also environmental criteria when VRA or nitrification inhibitors are applied.

Contrarily, longer-term experiments are requested to evaluate SD fraction sustainability.

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Iniziativa finanziata dal Programma di Sviluppo Rurale per il Veneto 2014-2020
Organismo responsabile dell’informazione: Gruppo Operativo DIG-CONTROL
Autorità di gestione: Regione del Veneto – Direzione AdG FEASR Parchi e Foreste
Copyright © 2023 ·Confagricoltura Veneto, via C. Monteverdi 15 – 30174 MESTRE VENEZIA (cod. fisc. 80009320278)

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